What to Do When Computer Shows Invalid System Disk Error

Roxanne updated on Jan 07, 2021 to Data Recovery | How-to Articles

Proven solution to fix invalid system disk problemare offered here. Try them one by one if your computer refused to boot and prompted "Invalid system disk. Replace the disk, and then press any key" error message. If you have any important files stored on the PC hard drive, free download EaseUS bootable data recovery software to check if it can help to retrieve them back or not.

Computer refused to boot and prompted "Invalid system disk. Replace the disk, and then press any key" error message? This issue was commonly seen in almost all Windows versions like Windows 10/8/7/XP and frustrated a large number of users. Here, we analyzed all the possible causes that might result in the invalid system disk problem and offered the corresponding solutions. And we also introduced a reliable bootable data recovery software for those who are urgent to find a way to recover data from the laptop that won't boot.  

Workable Solutions Step-by-step Troubleshooting
Fix 1. Recover your data Create a bootable disk > boot from the bootable USB > recover files...Full steps
Fix 2. Set first boot disk Go to BIOS, in the Boot tab, list the CD, removable device or hard drive first...Full steps
Fix 3. Repair MBR Download EaseUS Partition Master and create a WinPE bootable disk...Full steps
Fix 4. Repair disk errors Go to step 3 in the above tutorial, click "Check partition"...Full steps
Fix 5. Run automatic repair Repeatedly press F8 while the laptop is booting up, later it will show you...Full steps

Take following steps to fix invalid system disk error in Windows 10/8/7/XP

First. Recover your data from unbootable PC

If you have any important files stored on the PC hard drive, try EaseUS Data Recovery Wizard WinPE Edition to retrieve them back first in case data loss happens while you are trying to troubleshoot invalid system disk error.

Step 1. Create a bootable disk.

Prepare an empty USB. If you have important data on it, copy the data to another device. When you create a bootable disk, the data on the USB will be erased. EaseUS Data Recovery Wizard WinPE Edition will help you create a bootable disk. Connect the USB drive to PC, launch EaseUS Data Recovery Wizard WinPE Edition. Select the USB drive and click "Proceed" to create a bootable disk.

create a bootable disk with easeus

Step 2. Boot from the bootable USB.

Connect the bootable disk to PC that won't boot and change your computer boot sequence in BIOS. For most users, it works well when they restart their computer and press F2 at the same time to enter BIOS. Set to boot the PC from "Removable Devices" (bootable USB disk) or "CD-ROM Drive" (bootable CD/DVD) beyond Hard Drive. Press "F10" to save and exit.

Step 3. Recover files/data from a PC/laptop hard drive that won't boot.

When you boot from the USB, you can run EaseUS Data Recovery Wizard from the WinPE bootable disk. Select the drive you want to scan to find all your lost files. 

selet the drive

Click Scan to start the scanning process.

let the software scan the drive

Recover data from the computer or laptop. After the scan completed, you can preview all recoverable files, select the targeted files, and click the "Recover" button to restore your files. You'd better save all of the recovered data to another place to avoid data overwriting.

recover data from the computer

Second. Set a bootable disk as the first boot disk

After data recovery, you can start taking measures to fix invalid system disk error to make the PC boot and work properly. If you want to boot from the internal hard disk, unplug any USB flash drive, external hard drive, CD or floppy disk. And if you want to boot from a removable disk, please make sure it is bootable and have set as the first boot disk. To change the boot order, just go to BIOS, in the Boot tab, list the CD, removable device or hard drive first. Finally, save the settings and exit. 

Change the boot order to fix invalid system disk error

Third. Repair Master Boot Record

Corrupted Master Boot Record is one of the reasons for the appearance of an invalid system disk error. To exclude this factor, try EaseUS partition software to rebuild MBR

1. Download EaseUS Partition Master and create a WinPE bootable disk.
2. Boot PC from the bootable disk. It will guide you to the main window of EaseUS Partition Master.
3. Right-click the disk and choose "Rebuild MBR", and then choose the proper Operating System version.
4. Click "Apply" to confirm the operation.

Repair Master Boot Record to fix invalid system disk error

Fourth. Check and repair disk errors

Disk corruptions will also result in invalid system disk error, so if all the above methods don't work, try to check and repair disk errors with EaseUS partition software.

1. Go to step 3 in the above tutorial, click "Check partition".
2. Choose the way that you want to use to check the hard drive: "Check Partition Properties", "Call Windows Chkdsk to fix errors", "Surface Test". Click "OK".
3. Let the program automatically scan hard disk partition and repair any errors it has found. Finally, click "OK" to finish the process.

Check and repair disk errors to fix invalid system disk error

Finally. Perform an Automatic Repair

Still seeing invalid system disk error message? Repeatedly press F8 while the laptop is booting up, later it will show you Windows Boot Options menu, here go to Troubleshoot--> Advanced Boot Options, select Automatic Repair and follow the wizard instructions to complete the process.

Perform an Automatic Repair to fix invalid system disk error

If none of the methods helps, I am afraid you have to perform a clean install of Windows to completely eliminate all the possible reasons that might cause the invalid system disk error. 

Do You Need Specialized Services for System Boot Issues?
EaseUS also provides 1-on-1 remote assistance to fix the boot issue. If the solution above does not work for you, please contact our professionals via Email or LiveChat in this page. To ensure our professional assistance work, you are suggested to connect the unbootable system drive to a healthy computer when getting connected with us.

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Frequently Asked Questions

1. Why choose EaseUS Data Recovery Wizard?

"EaseUS Data Recovery Wizard is the best we've seen. It's far from perfect, partly because today's advanced disk technology makes data-recovery more difficult than it was with the simpler technology of the past, but it's fast and efficient..."PCMag

"The first thing you'll notice about EaseUS Data Recovery Wizard Pro is that its interface is very clear and uncluttered, with only a small collection of self-explanatory controls. You won't find lots of extra options hidden in a system of hidden menus, either; what you see really is what you get."techradar

"Recover lost files, even after deleting a partition or formatting your drive."Macworld

2. Why cannot I recover 2GB data for free?

It is recommended to check the version installed is Free or Trial because they are different versions.

Trial has data preview function but cannot save any files, while the Free version enables to recover 2 GB files. The default free space is 500 MB and you may share the product on social media to get another 1.5 GB.

3. Why cannot the recovered files be opened?

A file is saved as 2 parts on the storage device: directory info (which is comprised by file name, time stamp and size info, etc.) and data content.

If the files with original file names and folder structures cannot be opened, one possible reason is the corrupted directory info. There is still a chance to recover the data content with the RAW Recovery method in our software.

4. Why isn't it suggested to recover the files back to the original drive?

The storage structure of the lost files would be altered or damaged by any changes on the drive. If you save the recovered files back to the same drive, the original data structures and data content would be corrupted or overwritten, which causes permanent data loss. So you should prepare another disk to save the files.

5. How can I check whether my data is recoverable or not before purchase?

The Free version helps you save 2GB files, so verify the recovery quality of our product before purchase.

6. How long does it take to scan the drive?

It strongly depends on the capacity of your hard drive and the performance of your computer. As reference,most drive recoveries can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions.

About Data Recovery Wizard

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